Yes that part you stated is true, but really then they define in what I quoted from the rulebook as speed is only indicated on the dial. So that creates a major issue in that are they just referencing use this template like they do with barrel roll?
So lets follow your train of thought that speed is always associated with the manuever no matter what. So that brings us back to what Ziggy posted from the FAQ. That the upgraded takes presidence over downgrade. I will admit what following is going to be a bit shakey logic.
1) Daredevil and Ion Cannon are upgrading manuevers you normally have access to, or they are upgrading you to have access to manuevers you normally don't. Albiet that they are tied to actions.
I was going to do a stupid extremely thin logic jab using the upgrade bar as a joke.
The FAQ for this game is going to end up being bigger then the rulebook sometime soon. Might be an issue with the rules light thing they went with or just assuming everyone would see it the same way that they do.
Really I am just playing devil's advocate to your positon some. I can clearly see where you are coming from, and also see it being ruled either way by different people. After all they did put that nifty little mechanic in for handling disputes in the rulebook for situations like this.
Hopefully they will address this very soon, as it does seem to be a worthy question for them to answear. Just a shame that they haven't replied to rules inquiries in a while.